Thus spake NetExpress (netexpress (at) tiscali (dot) it [email concealed]) [16/05/03 16:42]:
> Product bsbsdftpd-6.0-ssl-0.6.1-1 http://bsdftpd-ssl.sc.ru/
>
> During a pen-test we have notice how is easy to identify valid users on
> vulnerable systems, through a simple timing attack.
>
> When I try to connect to ftp without ssl using a unreal user with bad
> password I get
> immediatly response of incorrect login, when I use real user with bad
> password I get 2 second of wait before get message of incorrect login.
>
> It seems to be very nice to the recent CAN-2003-0190 about OpenSSH/PAM
> timing attack allows remote users identification
>
> I have tested this on Linux RH 7.3 and RH 8.0
I just tried this out on a FreeBSD system (4.8-RC x2), and I get the same
response time. Are you sure this is directly related to the ftp daemon, or
is it a PAM issue?
> Product bsbsdftpd-6.0-ssl-0.6.1-1 http://bsdftpd-ssl.sc.ru/
>
> During a pen-test we have notice how is easy to identify valid users on
> vulnerable systems, through a simple timing attack.
>
> When I try to connect to ftp without ssl using a unreal user with bad
> password I get
> immediatly response of incorrect login, when I use real user with bad
> password I get 2 second of wait before get message of incorrect login.
>
> It seems to be very nice to the recent CAN-2003-0190 about OpenSSH/PAM
> timing attack allows remote users identification
>
> I have tested this on Linux RH 7.3 and RH 8.0
I just tried this out on a FreeBSD system (4.8-RC x2), and I get the same
response time. Are you sure this is directly related to the ftp daemon, or
is it a PAM issue?
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